I have this red exclamation point/mark on the lower left of the screen all the time, what is this?
Also, we've done 6 story missions now, but aren't there unique weapons to find or make? So far I'm only able to put electricity on weapons and the usual standard improvements. No things like add fire to a weapon, or poison, or spikes/nails and so on?
Keep playing, do sidequests and lost n founds etc. There's loooads of customisation for weapons.